You could go with the RIA and see how it shoots, if its good then little by little put the parts to it. If its not good, little by little you can put the parts to it.
Make it the way you want it. Some times even high priced ones dont run good.
There is an interesting article I posted on 1911's... No 1911 4 U
Like a car you might buy for $500, expect to put another $500 in it to make it run...LOL